Create a new network that wireless computers and devices can use to connect to the
Internet and to each other.
Extend an existing network. If the network is connected to the Internet, all the computers
and wireless devices on the AirPort network can use the Internet connection.
Computers connected to your AirPort Time Capsule using Ethernet can also access the
network to share files and connect to the Internet.
If you’re using your AirPort Time Capsule to connect to the Internet, you need a broadband
(DSL or cable modem) account with an Internet service provider, or a connection to the
Internet using an existing Ethernet network. If you received specific information from your
ISP (such as a static IP address or a DHCP client ID), you may need to enter it in AirPort Utility.
Have this information available before you set up your AirPort Time Capsule.